Fatigue resistance of SMA-martensite bars subjected to flexural bending

被引：22

作者：

Dolce, M ^{[1
]}

Cardone, D ^{[1
]}

机构：

[1] Univ Basilicata, Dept Struct Chem, I-85100 Potenza, Italy

来源：

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES | 2005年 / 47卷 / 11期

关键词：

shape memory alloys; fatigue life; fatigue damage theory; flexural bending;

D O I：

10.1016/j.ijmecsci.2005.05.007

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The fatigue resistance of Ni-Ti shape memory alloy (SMA)-martensite bars in bending subjected to large deformation cycles has been experimentally evaluated. Firstly, fatigue tests under constant displacement amplitude have been carried out, at two different frequencies of loading. Then, the cumulative fatigue damage and fatigue life prediction of specimens loaded under variable load conditions have been investigated. Finally, the effect of low-cycle-fatigue (LCF) and plastic deformations on subsequent high-cycle-fatigue (HCF) has been studied. The experimental results point out that the frequency of loading (i.e. temperature) significantly affects the fatigue life of the specimens. The damage accumulation process seems to follow the "Miner" linear damage theory for low-to-high (L-H) loading sequences, while the same does not hold for high-to-low (H-L) loading sequences. Surprisingly, a small fraction of LCF life consumption seems to enhance the subsequent HCF limits. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1693 / 1717

页数：25

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